Remove TODO and give a better "you're logged out" message to user

thrimbletrimmer/beta/edit.html

@@ -203,7 +203,6 @@
 		</div>
 
 		<div id="google-authentication">
-			<!-- TODO: Test with authentication on and ensure failed video submissions for authentication show the correct error message -->
 			<div id="google-auth-sign-in" class="g-signin2" data-onsuccess="googleOnSignIn"></div>
 			<a href="#" id="google-auth-sign-out" class="hidden">Sign Out of Google Account</a>
 		</div>

thrimbletrimmer/beta/scripts/edit.js

@@ -425,6 +425,8 @@ async function sendVideoData(edited, overrideChanges) {
 			submissionResponseElem.innerHTML = "";
 			submissionResponseElem.appendChild(serverErrorNode);
 			submissionResponseElem.appendChild(submitButton);
+		} else if (submitResponse.status === 401) {
+			submissionResponseElem.innerText = "Unauthorized. Did you remember to sign in?";
 		} else {
 			submissionResponseElem.innerText = `${
 				submitResponse.statusText